Setting up VMware update manager on ESXi 6

I will be setting up Update Mgr on esxi 6 which has 6 host and about 80 host.
I know the articles I have found say that to use SQL express, there should be 5 host with 50 VMS.
Is this set in stone or is ok for m to use SQL Express or should I use and existing SQL DBS?

Yes we just added the 6th host about a month ago and I never thought about SQL Express because that is what is running on the VCTR along with the 80 vms.
I guess I need to get SQL on the VCTR and remove SQL Express and if so, is there a good doc to follow to do this?
I don't want to add the Update Mgr now until I get SQL straightened out if I need to on the VCTR?

Teach the user how to use configure the vCenter Server storage filters
Open vSphere Web Client: Navigate to vCenter Server Advanced Settings: Add the four vCenter Server storage filters: Review the advanced settings: Modify the values of the four v…